Sure, so in-universe references would call it “leather,” and if any readers ask you just say it’s an in-universe analogue to leather that doesn’t come from the same source, but is similar enough that you decided to just use the word “leather” for it.
You could fluff it as “really good fake leather that is actually made from plants,” maybe?
It wouldn’t make sense to call it “fake leather,” unless use of real leather was common.
Sure, so in-universe references would call it “leather,” and if any readers ask you just say it’s an in-universe analogue to leather that doesn’t come from the same source, but is similar enough that you decided to just use the word “leather” for it.
A decent cop-out, in other words. :-P
oh, gotcha.